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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cf71a15e1dff02ee6240c85ce001709b9a52befc268d1e9ec6f2819a285f2c' 
  AND token = 'sLX7xIZY6YGFeIeN8OuiY+574N3znRF5+r9EkYcK9ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}